I wish I could show you my old schoolbooks, but obviously I don't have them anymore as I graduated a few years ago. The fact that there are multiple people who can report this--and yes, I am a stranger to the person who made this, check my history if need be--shows that it is happening in some places. Is it everywhere? No. No one is claiming that.
But you are insisting it DOESN'T happen. It does. I lived it, the artist lived it, others lived it. Count yourself lucky you didn't.